ircd/m_whowas.c

   1 /*
   2  * IRC - Internet Relay Chat, ircd/m_whowas.c
   3  * Copyright (C) 1990 Jarkko Oikarinen and
   4  *                    University of Oulu, Computing Center
   5  *
   6  * See file AUTHORS in IRC package for additional names of
   7  * the programmers.
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 1, or (at your option)
  12  * any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  *
  23  * $Id: m_whowas.c,v 1.12 2005/04/25 21:25:20 entrope Exp $
  24  */
  25
  26 /*
  27  * m_functions execute protocol messages on this server:
  28  *
  29  *    cptr    is always NON-NULL, pointing to a *LOCAL* client
  30  *            structure (with an open socket connected!). This
  31  *            identifies the physical socket where the message
  32  *            originated (or which caused the m_function to be
  33  *            executed--some m_functions may call others...).
  34  *
  35  *    sptr    is the source of the message, defined by the
  36  *            prefix part of the message if present. If not
  37  *            or prefix not found, then sptr==cptr.
  38  *
  39  *            (!IsServer(cptr)) => (cptr == sptr), because
  40  *            prefixes are taken *only* from servers...
  41  *
  42  *            (IsServer(cptr))
  43  *                    (sptr == cptr) => the message didn't
  44  *                    have the prefix.
  45  *
  46  *                    (sptr != cptr && IsServer(sptr) means
  47  *                    the prefix specified servername. (?)
  48  *
  49  *                    (sptr != cptr && !IsServer(sptr) means
  50  *                    that message originated from a remote
  51  *                    user (not local).
  52  *
  53  *            combining
  54  *
  55  *            (!IsServer(sptr)) means that, sptr can safely
  56  *            taken as defining the target structure of the
  57  *            message in this server.
  58  *
  59  *    *Always* true (if 'parse' and others are working correct):
  60  *
  61  *    1)      sptr->from == cptr  (note: cptr->from == cptr)
  62  *
  63  *    2)      MyConnect(sptr) <=> sptr == cptr (e.g. sptr
  64  *            *cannot* be a local connection, unless it's
  65  *            actually cptr!). [MyConnect(x) should probably
  66  *            be defined as (x == x->from) --msa ]
  67  *
  68  *    parc    number of variable parameter strings (if zero,
  69  *            parv is allowed to be NULL)
  70  *
  71  *    parv    a NULL terminated list of parameter pointers,
  72  *
  73  *                    parv[0], sender (prefix string), if not present
  74  *                            this points to an empty string.
  75  *                    parv[1]...parv[parc-1]
  76  *                            pointers to additional parameters
  77  *                    parv[parc] == NULL, *always*
  78  *
  79  *            note:   it is guaranteed that parv[0]..parv[parc-1] are all
  80  *                    non-NULL pointers.
  81  */
  82 #include "config.h"
  83
  84 #include "client.h"
  85 #include "hash.h"
  86 #include "ircd.h"
  87 #include "ircd_features.h"
  88 #include "ircd_log.h"
  89 #include "ircd_reply.h"
  90 #include "ircd_string.h"
  91 #include "msg.h"
  92 #include "numeric.h"
  93 #include "numnicks.h"
  94 #include "s_user.h"
  95 #include "s_misc.h"
  96 #include "send.h"
  97 #include "whowas.h"
  98
  99 /* #include <assert.h> -- Now using assert in ircd_log.h */
 100 #include <stdlib.h>
 101
 102 /*
 103  * m_whowas - generic message handler
 104  *
 105  * parv[0] = sender prefix
 106  * parv[1] = nickname queried
 107  * parv[2] = maximum returned items (optional, default is unlimited)
 108  * parv[3] = remote server target (Opers only, max returned items 20)
 109  */
 110 int m_whowas(struct Client* cptr, struct Client* sptr, int parc, char* parv[])
 111 {
 112   struct Whowas *temp;
 113   int cur = 0;
 114   int max = -1, found = 0;
 115   char *p, *nick, *s;
 116
 117   if (parc < 2)
 118   {
 119     send_reply(sptr, ERR_NONICKNAMEGIVEN);
 120     return 0;
 121   }
 122   if (parc > 2)
 123     max = atoi(parv[2]);
 124   if (parc > 3)
 125     if (hunt_server_cmd(sptr, CMD_WHOWAS, cptr, 1, "%s %s :%C", 3, parc, parv))
 126       return 0;
 127
 128   parv[1] = canonize(parv[1]);
 129   if (!MyConnect(sptr) && (max > 20))
 130     max = 20;                   /* Set max replies at 20 */
 131   for (s = parv[1]; (nick = ircd_strtok(&p, s, ",")); s = 0)
 132   {
 133     /* Search through bucket, finding all nicknames that match */
 134     found = 0;
 135     for (temp = whowashash[hash_whowas_name(nick)]; temp; temp = temp->hnext)
 136     {
 137       if (0 == ircd_strcmp(nick, temp->name))
 138       {
 139         send_reply(sptr, RPL_WHOWASUSER, temp->name, temp->username,
 140                    temp->hostname, temp->realname);
 141         if (IsAnOper(sptr) && temp->realhost)
 142           send_reply(sptr, RPL_WHOISACTUALLY, temp->name, temp->username, temp->realhost);
 143         send_reply(sptr, RPL_WHOISSERVER, temp->name,
 144                    (feature_bool(FEAT_HIS_WHOIS_SERVERNAME) && !IsOper(sptr)) ?
 145                      feature_str(FEAT_HIS_SERVERNAME) :
 146                      temp->servername,
 147                    myctime(temp->logoff));
 148         if (temp->away)
 149           send_reply(sptr, RPL_AWAY, temp->name, temp->away);
 150         cur++;
 151         found++;
 152       }
 153       if (max >= 0 && cur >= max)
 154         break;
 155     }
 156     if (!found)
 157       send_reply(sptr, ERR_WASNOSUCHNICK, nick);
 158     /* To keep parv[1] intact for ENDOFWHOWAS */
 159     if (p)
 160       p[-1] = ',';
 161   }
 162   send_reply(sptr, RPL_ENDOFWHOWAS, parv[1]);
 163   return 0;
 164 }